Driving device for program clocks



Aug. 14, n1928.

C. E. LARRAB'EE DRIVING DEVICE FDR PROGRAM CLOCKS Filed Oct; 28, 1924 2 Sheets-Sheet 1 laluna,

Aug. 14, 192s. 1,680,742

" C. E. LARRABEE DRIVING DEVICE E OR PROGRAM CLOCKS Fil'ed Oct. 28,' 1924 2 Sheets-Sheet 2 aMJa.

Patented ug. 14, 1928.

UNITED STA TES CLINTON E. LARRABEE, OF BINGI-IAMTON, NEW YORK, ASSIGNOR TO INTERNATIONAL TIME RECORDING COMPANY OE YORK, OF ENDICOTT, NEW YORK, A CORPO- RATION 0F NEW YORK.

DRIVING DEVICE FOR PROGRAM CLOCKS.

Application filed October 28, 1924. Serial No. 746,295.

According to the present invention pro` vision is made for advancing the program wheels by a stepped rapid movement instead of a constant slow movement and the motion is secured by the provision of a novel driving connection operating in combination with the program driven elements and the clock train driving elements.

In the drawings, v

Fig. 1 is a front view of a program device provided with my improvement.

Fig'. 2 is a side view of the driving connections whichimpart a jump movement to the program wheels.

Figs. 3 and 4 are detail top views of the parts in different operative positions.

In more detail, the program device proper is of conventional form including program discs 10 adapted to control the program contacts 11. The discs lOvarel driven by a gearY 12 which has meshed with it a small pinion 13 driven by bevel gearing 14. One of the bevel gears 14 is fixed to a shaft 15 which extends upwardly as shown in Fig. 2 and has a collar 16 secured to it by a screw 17. 18 denotes a fixed bracket plate preferably recessed with a rectangular Vopening to receive a collar member 19. This collar in turn receives a second collar member 20, the two collars being secured together by a screw 21. -Fast to the collar member 2O is a ratchet disc 22. Cooperating with the ratchet disc is a pawl`23 pivotally carried by a lever or crank member24 which is securelyy fast to thel collar 16 which, as previously stated, is secured to shaft 15. The pawl 23 is provided with a pin 25 extending into an angularslot 26 in adriving lever or double armed vmember 27. Part 27 is secured to a collar-like member 28 which is freely rotatable `upon the upper end of shaft l 15 and slotted at its upper end to receive the cross pin 29 of a universal joint which is carried by the clock driven shaft 30. rI`he shaft 30 will hereinafter be termed the main clock driving member for the program device. The extended ends of the two members 27 andl 24 are suitably connected by a spring 31. I

In operation the main clock driving shaft 3() gradually advances in a counterclockn wise direction. The to -be driven shaft 15 is held against rotationY by pawl 23 engaging the ratchet 22. As 27 isl rotated, the spring 31 is put under increased tension and the pawl 23 is gradually withdrawn from engagement with the ratchet. by reason of the camming action of slot 26 upon pin 25. Vhen the pawl reaches aposition clear of the ratchet (see Fig. 4) the spring tension of spring 31 acts to swing arms 24 in an anticlockwise direction ultimately reengaging the pawl 23 with the next ratchet tooth. In this way the driven arm 24 jumps the program drive shaft 15l forward step by l the coaction of the pawl and ratchet,and a Y spring connecting the said members' and adapted to advance the first mentioned member upon the release of the pawl from' the ratchet.

2. In a device of the class described in combination with a clock driving shaft, a program device, means driven in unison with eoY said clock shaft, meansmovable n unison means receiving energy upon the advance or the clock driving shaft for imparting movement to the said pawl upon its release with the program devices, a fixed ratchet, a pawl associated with said last mentioned means and arranged for cooperation therewith, means carried by 'the iirst mentioned means for swinging the pawl into or ont of cooperation with the ratchet and a resilient from said ratchet.

signature.

CLINTON E. LARRABEE. 

